Watch-case



(NoA Model.)

D. OHARA.

A WATCH GASE. No. 297,533. Patented Apr. 22,1884.

d( 41TH, 4l.

UNITED STATES DANIEL ofHAEA,

PATENT OFFICE.

OF WALTHAM, ASSIGNOR TO ROBBINS 8v APPLETON, OF

BOSTON, MASSACHUSETTS.

WATC H CAS E;

SPECIFICATION forming part of Letters Patent No. 297,533, dated April22, 1884.

Application filed December 1, 1883. (No model.)

To all whom t may concern:

Be it known that I, DANIEL OHARA, of Waltham, in the county of Middlesexand State of Massachusetts, have invented certain Improvements inVatch-Gases, of which the following is a speciiication.

This invention relates to watch-cases in which the movement is containedin a ring, which is externally threaded and screwed into thecase-center, as shown in the pending application of E. O. Fitch, SerialNo. 106,455, filed September 14,1883; and it has for its object toprovide additional means for excluding dust, die., from the back of themovement.

To this end my invention consists in the provision of a back cap orbezel adapted to be screwed to the internally-threaded portion of thecase-center, and cover the back of the movement inclosed in amovement-holding ring, as I will now proceed to describe.

Of the accompanying drawings, forming a part of this specification,Figure l represents a sectional view of awatch-case embodying myinvention. Figs. 2, 3, and 4 represent, respectively, sections of thecase center, the movement-holding ring, and the back cap or bezeldisconnected.

The same letters of Areference indicate the same parts in all thefigures.

In the drawings@ represents the case-center or body provided at one edgewith an internally-threaded portion, 2, and an externallythreadedportion or shoulder, 3, and atthe opposite edge with a seat, et.

b represents a ring adapted to contain and support a watch-movement, andprovided at one edge-with an externally-threaded portion, 5, adapted tobe screwed into the portion 2 of the case-center, and at its oppositeedge with a shoulder, 6, adapted to rest on the seat 4.

f represents a removable front bezel or cover, which is preferablyformed to snap onto a shoulder, 7, formed on the ring b, although, ifpreferred, said shoulder and bezel may be threaded so that the bezel maybe screwed onto the shoulder, or the shoulder 7 may be formed on thecase-center instead of on the ring.

The construction above described is sub- Stantially identical with thatdescribed in the application of E. C. Fitch, above referred to, 5o andof itself forms no part of my invention.

In carrying out my invention I (preferably) widen theinternally-threaded portion?. of the case-center so that it will extendbeyond the rear edge of the ring b, and screw to said ex 55 tendedthreaded portion a back cap or bezel,

m, which is externally threaded at 8 to engage with said threadedportion 2, and when screwed into the case-center effectuallyy closes orseals the rear portion of the ring and pre- 6o vents the possibility ofdust or moisture obtaining access to the movement through the back ofthe ring. The application of the back cap to the same threaded portionin the casecenter that receives the movement-holding ring simplifies andreduces the cost of construction.

It is obvious that the back cap, m, may be entirely of metal, or it maybe a glass-holding bezel. 7o

' I claim- 1. The combination, in a watch-case, of the case centerhaving an internally threaded portion, and an external or outer-back, d,the movementholding ring screwed into said threaded portion, and theback cap or bezel m, screwed to the case-center, and serving as anadditional protection for the back of the movement, the case-center orthe ring being provided with a front bezel protecting the front of themovement, as set forth.

2. The combination, in a watch-case, of the case center having auinternally -threaded portion, 2, and an external or outer back, themovement-holding ring, and the back cap or bezel, both externallythreaded and screwed into the threaded portion of the center, saidportion being suitably widened to receive the ring and back cap, as setforth.

In testimony whereof I have signed my name 9o to this speciiicatiominthe presence of two subscribing witnesses, this 23d day of November,1883.

DANIEL OHARA.

Witnesses:

CHARLES F. STONE, REINHOLD MILLER.

